#root {
  width: 640px;
  margin: 0 auto;
}

.container {
  height: 300px;
  border: 1px solid #000;
  overflow-y: auto;
}

.item {
  padding: 0 20px;
  height: 36px;
  line-height: 36px;
  border-bottom: 1px solid green;
}
